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- 5 - (7 ) + 4
-5 - 7 + 4
-12 + 4
- 8
c) (+3 – 2 + 4 – 6 ) + (-1 + 7) – 12
(1+4-6) + (6) - 12
(5-6) + 6 - 12
-1 + 6 - 12
5 - 12
- 7
d) +12 – (+16 – 11 + 3 ) – ( - 3 + 5)
+ 12 - ( 5 + 3 ) - ( 2)
12 - (8) - 2
12 - 8 - 2
4 - 2
2
e) -8 + ( + 5 – 9 ) – 6 – (-8 + 3 + 5)
- 8 + (-4) - 6 - (-5+5)
- 8 - 4 - 6 -(0)
-12 - 6
- 18